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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.
Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
![The testes. In addition to producing sperm, the testes secrete the male sex hormones, primarily test](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_42_28_8238159.jpeg)
![When the United States gets stuck over a controversial issue—usually something a divided Congress ca](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_37_16_22180672.png)